Which of the following accurately describes carbon atoms?

a. carbon atoms can bond to other carbon atoms.
b. when carbon atoms bond to other carbon atoms, they can only form triple bonds.
c. carbon atoms only have three electrons available for bonding.
d. carbon atoms are only found in two of the four main macromolecules

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.